# Glossary Entries

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 Half Hour A period of time lasting 30 minutes. Halving Dividing or separating into two equal parts; reducing to one half. Height Width is a distance value that is vertical.You might have a height of two meters, but you also have a width of .5 meters. Length, width, and height are terms used to describe two-dimensional objects. Depth is a term applied to three dimensional objects. The perpendicular distance from a vertex to the line containing the opposite side of a plane figure. Another term for height is altitude. Heptagon A seven sided polygon (or flat shape). Hexagon A six sided polygon (or flat shape). Histogram A special kind of vertical bar graph that displays the frequency of data that has been organized into equal intervals. The intervals cover all possible values of data so there are no spaces between the bars of the graph. The horizontal axis is divided into continuous equal intervals. It is used to represent frequency data in statistics. Horizontal Parallel to or in the plane of the horizon. Horizontal Line A line that is parallel to the horizon. A horizontal line is straight across. Hour A unit used to measure time, 1/24of a day; 1 hour = 60 minutes. The abbreviation for hour is often "h." Hour Hand The shorter hand on an analog clock. Hundred Chart A 10 by 10 grid representing the numbers from 1 to 100. There are ten rows and ten columns. Hundreds Place The place value located three places to the left of the decimal point in a number; the third digit to the left of the decimal point. Hundredths The place value located two places to the right of the decimal point in a number. The second digit to the right of the decimal point. Hypotenuse The side of a right triangle opposite the right angle;the longest side of a right triangle.

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